One of Russia’s most active volcanoes has erupted, spewing plumes of ash 5 kilometers into the sky over the Kamchatka Peninsula in Russia's Far East. The Shiveluch volcano began sputtering shortly after a powerful earthquake struck off Kamchatka’s east coast early on August 18, according to volcanologists from the Russian Academy of Sciences who warned that another, even more potent earthquake may be on the way. The academy’s Institute of Volcanology and Seismology released a video showing the ash cloud over Shiveluch stretching more than 490 kilometers southeast of the volcano. The Ebeko volcano on the Kuril Islands also spewed ash into the sky, the institute said. It did not explicitly say whether the earthquake touched off the eruptions.